Preheat oven to 350°F.

Combine butter and both sugars in the bowl of a stand mixer; mix on speed 2 for 3 minutes.

Add yogurt, mixing until incorporated and scraping sides, if necessary.

Add vanilla, baking powder, baking soda, salt, and flour, mixing until combined.

Stir in 2 cups of cereal until evenly distributed.

Scoop heaping teaspoons of dough onto parchment paper-lined baking sheet.

Bake for 14 minutes or until bottoms are golden.

Transfer to a baking rack to cool.

Combine powdered sugar and vanilla in a small bowl.

Add milk 1/2 tablespoon at a time, until glaze reaches desired consistency.

Spread glaze on top of cooled cookies, and sprinkle with remaining fruit cereal.